New immunological aspects of peri-implantitis

ABSTRACT Objective: This study aimed to compare the levels of HIF1-α, VEGF, TNF-α, and IL-10 in the peri-implant crevicular fluid of patients with and without peri-implantitis. Methods: Forty patients, comprising 16 with and 24 without peri-implantitis were selected. Results: Patients with peri-implantitis exhibited significantly higher HIF-1α levels than those without peri-implantitis (p=0.0005). TNF-α revealed significant positive correlations with IL-10 (p=0.0008) and VEGF (p=0.0246), whereas HIF-1α and IL-10 levels (p=0.0041) demonstrated a negative and significative correlation in the peri-implantitis group. Conclusion: This study, for the first time demonstrates the balance of HIF-1α, TNFα, IL-10, and VEGF in peri-implantitis. It shows an elevated HIF-1α levels in patients with peri-implantitis, which could have stemmed from persistent inflammation- triggered hypoxia. Furthermore, the positive correlation between TNF-α and VEGF suggests intensified proinflammatory activity in peri-implantitis. Nevertheless, further studies are essential to understand these immune dynamics in peri-implantitis.

Effects of HMGB1/TLR4 on secretion IL-10 and VEGF in human jaw bone-marrow mesenchymal stem cells

Abstract Objective: We aimed to investigate the regulatory effects of HMGB1/TLR4 signaling pathway on the expression of IL-10 and VEGF in human bone marrow mesenchymal stem cells. Methodology: Human JBMSCs were isolated and cultured. Then, HMGB1 was added into the JBMSCs culture medium, and the protein and mRNA expression levels of IL-10 and VEGF were assessed. Moreover, cells were pretreated with a specific TLR4 inhibitor (TAK-242), and the expression changes of IL-10 and VEGF were compared. Results: Compared with the control group, exposure to HMGB1 in human JBMSCs up-regulated TLR4, IL-10, and VEGF secretion at both protein and mRNA levels (P<0. 05). In addition, the increased expression of IL-10 and VEGF could be restrained in TAK-242 group compared with the HMGB1 group (P<0.05). Conclusions: The results indicated that HMGB1 activate TLR4 signaling pathway in Human JBMSCs, which plays a regulatory role in cytokines expression.

Análise mecânica comparativa do destorque de parafusos de minipilar com um novo componente protético, juntamente com avaliação microbiológica do vedamento para implantes de plataforma Cone Morse / Comparative mechanical analysis of the untorsion of miniabutment screws with a new prosthetic component, together with microbiological evaluation of the seal for Cone Morse platform implants

A interface implante pilar (IAI) por se constituir de duas peças inevitavelmente apresentam micro lacuna (GAP), na qual pode ocorrer infiltração bacteriana, permitindo a penetração de microorganismos que colonizam na parte interna do implante levando ao acúmulo de biofilme e, podendo levar ao desenvolvimento da periimplantite. O desgaste da conexão interna do implante é algo que ocorre com frequência, muitas vezes pela fratura do parafuso e/ou, pela perda da rosca interna do implante. A ausência de informações prévias também pode gerar a necessidade da remoção do implante, devido a estas intercorrências, surge a possibilidade da criação de um novo componente para implantes para possibilitar a reabilitação protética, sem ter que passar por uma nova cirurgia de remoção e instalação do implante. O objetivo do trabalho foi mensurar o nível de afrouxamento do parafuso do pilar protético e do minipilar comparando com novo componente protéticos, na tentativa de simular o comportamento do conjunto implante/pilar/prótese. Foram utilizados vinte implantes de plataforma cone morse (CM) da DSP® com seus respectivos mini pilares, na qual foram distribuídos em 2 grupos(n=10): Grupo 1 - implante CM + mini pilar FlexCone® DSP + coroa simplificada pirâmide invertida carga aplicada 3 mm do centro da coroa. E Grupo 2 - implante CM + mini pilar novo + coroa simplificada pirâmide invertida carga aplicada 3 mm do centro da coroa. Foram realizados ciclagem mecânica com carga 133 N, durante 2x106 ciclos, com frequência 2 Hz e temperatura de 37ºC em ambos grupos. Um torquímetro digital foi usado para medir os valores de torque reverso do parafuso protético da coroa e também do pilar protético, antes e após o carregamento. Os resultados do modelo de regressão demonstraram diferenças estatisticamente significativas em função do envelhecimento comparando os grupos da coroa sobre o pilar protético (p = 0.020) e entre os grupos do pilar sobre o implante (p = 0.048), indicando que após o envelhecimento de 2.000.000 de ciclos ao longo do tempo está associado de maneira significativa a essas variáveis no contexto deste estudo. O segundo objetivo deste estudo foi avaliar in vitro a taxa de infiltração bacteriana através da IAI, entre o novo componente protético e a superfície interna do implante, juntamente foi analisado a permeabilidade do IAI para colonização bacteriana. Um total de oitenta implantes foram testados. As estruturas montadas para grupo 1 foi torqueado com 20 N/cm e do G2 foram torqueados com 45 N, ambos imersos em microtubos contendo 200 µl de saliva humana. Após 14 dias de incubação da amostra de bactéria nos implantes, foi realizada uma análise qPCR (reação da cadeia da polimerase em tempo real). O teste revelou que não houve diferenças estatisticamente significativas no crescimento bacteriana entre os grupos em qualquer um dos pontos temporais analisados. Conclui-se que o novo componente testado apresentou um destoque menor do que comparado ao mini pilar FlexCone DSP® e apresentou infiltração bacteriana no GAP da conexão implante-pilar semelhante comparado ao mini pilar original da empresa (AU)

The abutment implant interface (IAI), as it consists of two pieces, inevitably presents a micro gap (GAP), in which bacterial infiltration can occur, allowing the penetration of microorganisms that colonize in the internal part of the implant, leading to the accumulation of biofilm and, which can lead to development of peri-implantitis. Wear of the implant's internal connection is something that occurs frequently, often due to screw fracture and/or loss of the implant's internal thread. The lack of prior information can also generate the need to remove the implant, due to these complications, the possibility arises of creating a new component for implants to enable prosthetic rehabilitation, without having to undergo a new surgery to remove and install the implant. implant. The objective of the work was to measure the level of screw loosening of the prosthetic abutment and the mini-abutment compared with the new prosthetic component, in an attempt to simulate the behavior of the implant/ abutment/prosthesis set. Twenty DSP® morse cone (CM) platform implants were used with their respective mini pillars, which were distributed into 2 groups (n=10): Group 1 - CM implant + FlexCone® DSP mini pillar + simplified crown inverted pyramid load applied 3 mm from the center of the crown. And Group 2 - CM implant + new mini abutment + simplified crown inverted pyramid load applied 3 mm from the center of the crown. Mechanical cycling was carried out with a load of 133 N, for 2x106 cycles, with a frequency of 2 Hz and a temperature of 37ºC in both groups. A digital torque wrench was used to measure the reverse torque values of the prosthetic crown screw and also the prosthetic abutment, before and after loading. The results of the regression model demonstrated statistically significant differences as a function of aging comparing the crown-on-prosthetic abutment groups (p =0.020) and between the abutment-on-implant groups (p = 0.048), indicating that after aging 2,000 ,000 cycles over time is significantly associated with these variables in the context of this study. The second objective of this study was to evaluate in vitro the rate of bacterial infiltration through the IAI, between the new prosthetic component and the internal surface of the implant, together with the permeability of the IAI for bacterial colonization. A total of eighty implants were tested. The assembled structures for group 1 were torqued with 20 N/cm and G2 were torqued with 45 N, both immersed in microtubes containing 200 µl of human saliva. After 14 days of incubation of the bacteria sample in the implants, a qPCR (real-time polymerase chain reaction) analysis was performed. The test revealed that there were no statistically significant differences in bacterial growth between groups at any of the time points analyzed. It is concluded that the new component tested presented a lower impact compared to the FlexCone DSP® mini abutment and presented bacterial infiltration in the GAP of the implant-abutment connection similar to the company's original mini abutment.(AU)

Abordajes de una molestia periimplantar

Los implantes dentales se han convertido en un componente rutinario de la práctica dental diaria. A la vez, pueden producir molestias, destrucción desenfrenada de la salud bucal o reemplazo quirúrgico y costoso de un implante fallido. La detección temprana de la pérdida ósea marginal es vital para la planificación del tratamiento y el pronóstico de los implantes. Estos están diseñados para adaptarse mejor a los diversos tipos de hueso y fallan debido a muchas razones. Entender los desafíos y las expectativas del paciente a través de la honestidad, es una parte importante del tratamiento, cuyo éxito no solo dependerá de los integrantes del equipo implantológico o de técnica, sino también del cuidado del paciente al realizar su higiene diaria. Por esa razón, se realizó una búsqueda bibliográfica en las bases de datos MEDLINE y PubMed sobre molestias periimplantar, consultándose 30 referencias de los últimos cinco años.

Dental implants have become a routine component of daily dental practice. At the same time, they can cause discomfort, rampant destruction of oral health, or expensive surgical replacement of a failed implant. Early detection of marginal bone loss is vital for treatment planning and implant prognosis. These are designed to best fit various bone types and fail due to many reasons. Understanding the patient's challenges and expectations through honesty is an important part of the treatment, whose success will not only depend on the members of the implantology or technical team, but also on the patient's care when performing their daily hygiene. For this reason, a bibliographic search was carried out in the MEDLINE and PubMed databases on peri-implant discomfort, consulting 30 bibliographical references from the last 5 years.

Evaluation of IL-4, MIP-1α, and MMP-9 gene expression levels in peri-implant tissues in peri-implantitis

Abstract This case-control study evaluated the gene expression levels of interleukin (IL)-4, macrophage inflammatory protein type 1 alpha (MIP-1α), and metalloproteinase (MMP)-9, factors involved in the formation of giant cells in healthy peri-implant tissue and peri-implantitis. Thirty-five subjects (15 healthy and 20 with peri-implantitis), who met the inclusion and exclusion criteria, were included in this study. The peri-implant tissue biopsies were subjected to total RNA extraction, DNAse treatment, and cDNA synthesis. Subsequently, the reaction of real-time PCR was performed to evaluate the gene expression levels of IL-4, MIP-1α, and MMP-9 concerning the reference gene. IL-4 gene expression showed higher (18-fold) values in the Peri-Implantitis Group of Patients when compared with the Healthy (Control) Group (p<0.0001). Although MIP- 1α and MMP-9 gene expression levels were higher in diseased implants, they showed no significant differences (p=0.06 and p=0.2337), respectively. Within the limitations of this study, the results showed that in tissues affected by peri-implantitis, only levels of Il-4 were increased when compared with tissues in the control group.

Resumo Este estudo caso-controle teve como objetivo avaliar a expressão gênica dos níveis de interleucina (IL)-4, proteína inflamatória de macrófagos tipo alfa 1 (MIP-1α) e metalopreoteinase (MMP)-9, todos fatores envolvidos na formação de células gigantes em tecidos peri-implantares saudáveis e com peri-implantite. Trinta e cinco indivíduos (15 saudáveis e 20 com peri-implantite) foram incluídos nesse estudo seguindo os critérios de inclusão e exclusão. Os tecidos peri-implantares foram submetidos a extração do RNA total, tratamento de DNAse e síntese de cDNA. Subsequentemente, a reação de PCR em tempo real foi realizada para avaliar os níveis da expressão de IL-4, MIP-1α, e MMP-9 em relação ao gene de referência. O nível de expressão de IL-4 foi estatisticamwente maior (18 vezes) nos tecidos de pacientes com peri-implantite quando comparados aos pacientes saudáveis (grupo controle) (p<0,0001). Embora os níveis de expressão de MIP- 1α e MMP-9 apresentassem maiores valores nos implantes doentes, esses níveis não foram estatisticamente significantes (p=0.06 and p=0.2337) respectivamente. Dentro das limitações desse estudo, os resultados mostraram que nos tecidos afetados pela peri-implantite, apenas os nívies de IL-4 estavam aumentados quando comparados ao grupo controle.

Resolución de peri-implantitis en una paciente con múltiples implantes comprometidos. Reporte de caso

El propósito de este reporte es describir el tratamiento no quirúrgico y quirúrgico en una paciente con múltiples implantes con peri-implantitis. Inflamación, sangrado espontáneo, supuración y pérdida ósea fueron los signos clínicos y radiográficos observados en los 21 implantes presentes en su boca. Las profundidades al sondaje oscilaban entre 5 y 15 mm. Se llevó a cabo la terapia no quirúrgica asociada a antibióticos sistémicos (Metronidazol 500 mg) y antiséptico (Clorhexidina 0,12%) con la finalidad de reducir los signos de inflamación y sangrado. Durante la re-evaluación se colocaron gránulos de Minociclina de liberación controlada en las bolsas residuales. Los sitios que no respondieron fueron abordados quirúrgicamente, realizando además la implantoplastia de las espiras que quedaron expuestas al medio bucal. Uno de los implantes debió ser explantado. A los 9 meses, no presentaba signos de inflamación peri-implantar, sangrado al sondaje ni pérdida ósea progresiva.

The aim of this report is to describe the non-surgical and surgical treatment of a patient with multiple implants with peri-implantitis. Inflammation, spontaneous bleeding, suppuration and bone loss were the clinical and radiographic signs observed in the 21 implants present in her mouth. Probing depths ranged from 5 to 15 mm. Non-surgical therapy with systemic antibiotics (Metronidazole 500 mg) and antiseptic (Chlorhexidine 0.12%) was carried out in order to reduce the signs of inflammation and bleeding. During re-evaluation, controlled-release minocycline granules were placed in the residual pockets. The sites that did not respond were approached surgically. Also, the implantoplasty of the threads that were exposed to the oral environment was performed. One of the implants had to be explanted. At 9 months, there were no signs of peri-implant inflammation, bleeding on probing or progressive bone loss.

Periimplantite e a importância do especialista em periodontia na manutenção dos tecidos / Periimplantitis and the importance of the periodontic specialist in tissue maintenance

Introdução: A peri-implantite é uma condição patológica associada a placa que ocorre nos tecidos de suporte ao redor de implantes dentários. Se caracteriza pela presença de sinais clínicos proveniente de inflamação na mucosa periimplantar conhecido como mucosite e subsequente perda progressiva do osso de suporte denominado como periimplatite. Objetivo: Classificar os principais sinais e sintomas clínicos da doença periimplantar a fim de estabelecer um diagnóstico, apresentar quais fatores devem ser avaliados durante o planejamento e manutenções de implantes dentários, os fatores de risco locais e sistêmicos, o tratamento e a importância do implantodontista com o periodontista realizar planejamento correto visando um prognostico favorável. Metodologia: Revisão de literatura foi realizada no PubMed, buscando artigos dos anos de 2010 a 2021. Resultado: Os estudos mostraram que o acúmulo de placa bacteriana nos implantes resultará no desenvolvimento de mucosite e podendo posteriormente se estabelecer a peri-implantite. Uma história de doença periodontal, tabagismo e falta de terapia de suporte devem ser considerados como indicadores de risco para o desenvolvimento de peri-implantite. Conclusão: É de suma importância o trabalho simultâneo do implantodontista com o periodontista com o intuito de se obter um bom planejamento e consequentemente reduzir danos a curto e longo prazo nos tecidos periimplantares. O sucesso do tratamento de doenças periimplantares está na prevenção, envolvendo reforço de higiene oral e manutenções periódicas(AU)

Introduction: A peri-implantitis is a plaqueassociated pathological condition that occurs in the supporting tissues around dental implants. If indifferent to the presence of proven clinical signs of inflammation in the peri-implant mucosa known as mucosite and subsequent progressive loss of supporting bone termed as peri-implatite. Objective: To classify the main signs and clinical signs of peri-implant disease an objective to establish a diagnosis, present the factors to be adopted during the planning and maintenance of dental implants, the local and systemic risk factors, the treatment and the importance of the implantodontist with the periodontist carrying out correct planning, a favorable prognosis. Methodology: A literature review was performed in PubMed, looking for articles from 2010 to 2021. Results: Advanced studies show that the accumulation of bacterial plaque in implants will result in the development of mucositis and may subsequently establish peri-implantitis. A history of periodontal disease, smoking and lack of supportive therapy should be considered as risk indicators for the development of peri-implantitis. Conclusion: The simultaneous work of the implantodontist with the periodontist is of paramount importance in order to obtain a good planning and consequently reduce short and long-term damage to the peri-implant tissues. The successful treatment of peri-implant diseases lies in prevention, involving reinforcement of oral hygiene and periodic maintenance(AU)

In vitro research of oral microscope-assisted implant surface decontamination / 华西口腔医学杂志

OBJECTIVES@#To investigate the effect of oral microscope-assisted surface decontamination on implants in vitro.@*METHODS@#Twelve implants that fell off because of severe peri-implantitis were collected, and decontamination was carried out on the surfaces of implants through curetting, ultrasound, titanium brushing, and sandblasting at 1×, 8×, or 12.8× magnifications. The number and sizes of residues on the implants' surfaces after decontamination were determined, and the decontamination effect was analyzed according to the thread spacing in the different parts of the thread.@*RESULTS@#1) The 8× and 12.8× groups scored lower for implant surface residues than the 1× group (P<0.000 1), and the 12.8× group scored lower than the 8× group (P<0.001); 2) no difference in residue score was found between the wide and narrow thread pitch (P>0.05), and the 8× and 12.8× groups had lower scores than the 1× group (P<0.001); 3) the lowest number of contaminants was observed at the tip of the thread, whereas the highest was observed below the thread, and the difference was significant (P<0.001). However, the thread pitch had no effect on the number of contaminants in different areas (P>0.05); 4) the residue scores of the 8× and 12.8× groups were lower than those of the 1× group at the thread tip and above, sag, and below the thread of the implants (P<0.05).@*CONCLUSIONS@#Residues on the surfaces of contaminated implants can be effectively removed by using an oral microscope. After decontamination, the residues of pollutants were mainly concentrated below the thread of the implants, and the thread pitch of the implants had no significant effect on the residues.

Research progress and application of rodents model construction of peri-implantitis / 口腔医学

@#With the increasing popularity of dental implants, prevalence of peri-implantitishas also been increasing in recent years. However, a deeper understanding of the pathogenesis of peri-implantitis is still lacking. Animal models are a good bridge for studying the pathogenesis of clinical diseases. Animals such as mini-pigs, canines, non-human primates and rodents are used to construct animal models of peri-implantitis. Among them, rodents are easy to obtain and feed, and have a wide range of applications for research. In this review, we summarize the construction of rodent modelswithperi-implantitis as well as the research progress and applications.

Re-osseointegration of peri-implantitis affected and failed implants / 口腔医学

@#Peri-implantitis and implant failure are common issues in the implant dentistry. The contaminated implant can be treated with mechanical, chemical and assisted methods for the formation of re-osseointegration. Re-osseointegration is achievable with valid bone regeneration strategies. The survival rate of implant into the site of previous failure is lower than that of the initial implant. For the hopeless and failed implant, it is necessary to remove the implant with corresponding technique.

Profiles and differences of submucosal microbial in peri-implantitis and health implants: A cross-sectional study / 北京大学学报(医学版)

OBJECTIVE@#To describe the submucosal microbial profiles of peri-implantitis and healthy implants, and to explore bacteria that might be correlated with clinical parameters.@*METHODS@#In the present cross-sectional study, 49 patients were recruited. Each patient contributed with one implant, submucosal biofilms were collected from 20 healthy implants and 29 implants with peri-implantitis. DNA was extracted and bacterial 16S ribosomal RNA (16S rRNA) genes were amplified. Submucosal biofilms were analyzed using 16S rRNA sequencing at Illumina MiSeq platform. Differences between the groups were determined by analyzing α diversity, microbial component and microbial structure. The potential correlation between the bacteria with pocket probing depth (PPD) of peri-implant calculated by Spearman correlation analysis.@*RESULTS@#The α diversity of submucosal microbial of health group was significantly lower than that in peri-implantitis group (Chao1 index: 236.85±66.13 vs. 150.54±57.43, P < 0.001; Shannon index: 3.42±0.48 vs. 3.02±0.65, P=0.032). Principal coordinated analysis showed that the submucosal microbial structure had significant difference between healthy and peri-implantitis groups [R2=0.243, P=0.001, analysis of similarities (ANOSIM)]. Compared with healthy implants, relative abundance of periodontal pathogens were higher in peri-implantitis, including members of the red complex (Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola) and some members of orange complex (Precotella intermedia, Eubacterium nodatum, Parvimonas micra), as well as some new periodontal pathogens, such as Fillifactor alocis, Fretibacterium fastidiosum, Desulfobulbus sp._HMT_041, and Porphyromonas endodontalis. Spearman correlation analysis revealed that the relative abundance of Treponema denticola (r=0.686, P < 0.001), Tannerella forsythia (r=0.675, P < 0.001), Fretibacterium sp. (r=0.671, P < 0.001), Desulfobulbus sp._HMT_041 (r=0.664, P < 0.001), Filifactor alocis (r=0.642, P < 0.001), Fretibacterium fastidiosum (r=0.604, P < 0.001), Porphyromonas gingivalis (r=0.597, P < 0.001), Porphyromonas endodontalis (r=0.573, P < 0.001) were positive correlated with PPD. While the relative abundance of Rothia aeria (r=-0.615, P < 0.001) showed negatively correlation with PPD.@*CONCLUSION@#Marked differences were observed in the microbial profiles of healthy implants and peri-implantitis. The members of red and orange complex as well as some new periodontal pathogens seem to play an important role in peri-implant disease. Compared with healthy implants, the submucosal microbial of peri-implantitis were characterized by high species richness and diversity.

Comparison of three methods for establishing rat peri-implantitis model / 北京大学学报(医学版)

OBJECTIVE@#To compare the efficiency and effect of establishing rat peri-implantitis model by traditional cotton thread ligation and local injection of Porphyromonas gingivalis lipopolysaccharide (LPS) around the implant, as well as the combination of the two methods.@*METHODS@#Left side maxillary first molars of 39 male SD rats were extracted, and titanium implants were implanted after four weeks of healing. After 4 weeks of implant osseointegration, 39 rats were randomly divided into 4 groups. Cotton thread ligation (n=12), local injection of LPS around the implant (n=12), and the two methods combined (n=12) were used to induce peri-implantitis, the rest 3 rats were untreated as control group. All procedures were conducted under 5% isoflurane inhalation anesthesia. The rats were sacrificed 2 weeks and 4 weeks after induction through carbon dioxide asphyxiation method. The maxilla of the rats in the test groups were collected and marginal bone loss was observed by micro-CT. The gingival tissues around the implants were collected for further real time quantitative PCR (RT-qPCR) analysis, specifically the expression of tumor necrosis factor-alpha (TNF-α) as well as interleukin-1β (IL-1β). The probing depth (PD), bleeding on probing (BOP) and gingival index (GI) of each rat in the experimental group were recorded before induction of inflammation and before death.@*RESULTS@#After 4 weeks of implantation, the osseointegration of implants were confirmed. All the three test groups showed red and swollen gums, obvious marginal bone loss around implants. After 2 weeks and 4 weeks of inflammation induction, PD, GI and BOP of the three test groups increased compared with those before induction, but only BOP was statistically significant among the three test groups (P < 0.05). At the end of 2 weeks of inflammation induction, marginal bone loss was observed at each site in the cotton thread ligation group and the combined group. At each site, the bone resorption in the combined group was greater than that in the cotton thread ligation group, but the difference was not statistically significant (P > 0.05), bone resorption was observed at some sites of some implants in LPS local injection group. At the end of 4 weeks of inflammation induction, marginal bone loss was observed at all sites in each group. The marginal bone loss in the cotton thread ligation group and the combined group was greater than that in the LPS local injection group, and the difference was statistically significant (P < 0.05). At the end of 2 weeks and 4 weeks of induction, the expression of TNF-α and IL-1β in the test groups were higher than those in the control group (P < 0.05).@*CONCLUSION@#Compared with local injection of LPS around the implant, cotton thread ligature and the two methods combined can induce peri-implantitis in rats better and faster.

Effectiveness of ozone therapy in the treatment of periodontal diseases: a systematic review / Eficácia da ozonioterapia no tratamento de doenças periodontais: uma revisão sistemática

ABSTRACT The aim of this study was to evaluate the effectiveness of ozone as an adjuvant factor in the treatment of periodontal diseases. A systematic review was carried out using the PubMed, LILACS/BIREME, CoChrane, and Scielo databases and manual searches. Clinical studies published in English, Spanish, Portuguese, and French, between 1950 and 2020 that evaluated the effects of ozone in the treatment of periodontal diseases were included. The search resulted in 178 articles, of which 24 met the proposed eligibility criteria and were selected for this review. The risk of bias was assessed for each selected study in accordance with the Cochrane risk-of-bias tool - version 5.1.0. The selected studies evaluated the effect of ozone therapy on periodontitis, gingivitis, and peri-implant diseases. It was observed that the ozone in its oily form presented the best clinical results. In cases of periodontitis, it was concluded that ozone therapy in the gaseous form did not bring any additional benefit. With respect to gingivitis, ozone provided faster remission compared to the control group. And in peri-implant disease cases, ozone had the capacity to reduce the development of mucositis. Regarding microbiology, it was observed that ozone can continuously and significantly reduce periodontal microorganisms; however, with no difference from control groups. Further studies with adequate control of biases are suggested, using ozone in the oily or aqueous form, which are the most promising forms, also evaluating the possible effectiveness of ozone by-products.

RESUMO O objetivo deste estudo foi avaliar a eficácia do uso do ozônio como fator adjuvante no tratamento das doenças periodontais. Foi realizada uma revisão sistemática utilizando as bases de dados PubMed, LILACS/BIREME, CoChrane, Scielo e pesquisa manual. Foram incluídos estudos clínicos publicados em inglês, espanhol, português e francês entre 1950 e 2020, que avaliaram os efeitos do ozônio no tratamento de doenças periodontais. A busca resultou em 178 artigos, destes 24 estudos atenderam aos critérios de elegibilidade propostos e foram selecionados para esta revisão. Foi realizada a avaliação do risco de viés em cada estudo selecionado de acordo com a ferramenta de avaliação de risco de viés Cochrane Risk of Bias Tool - versão 5.1.0. Os estudos selecionados avaliaram o efeito da ozonioterapia na periodontite, gengivite e em doenças peri-implantares. Observou-se que a utilização do ozônio na forma oleosa foi a que apresentou os melhores resultados clínicos. Nos casos de periodontite, concluiu-se que a ozonioterapia não trouxe nenhum benefício adicional sob a forma gasosa. Em relação à gengivite, o ozônio proporcionou uma remissão mais rápida do que do grupo controle. E nas doenças peri-implantares, o ozônio foi capaz de reduzir o desenvolvimento da mucosite. Com relação a microbiologia, foi observado que o ozônio pode reduzir contínua e significativamente os microorganismos periodontais, contudo, sem diferença para grupos controle. Sugerem-se mais estudos com controle adequado de vieses, utilizando o ozônio de forma oleosa ou aquosa, formas mais promissoras, além da avaliação de possível eficácia de subprodutos do ozônio.

PHOTOBIOMODULATION IN DENTAL IMPLANT THERAPY: A REVIEW

Photobiomodulation (PBM) or formerly known as low-level laser therapy (LLLT) is nothing but low-dosage biophotonics for therapy which presents an advancing new era of regenerative modalities in dental implantology. It utilizes light emitting diodes (LEDs), broad light sources and lasers for this purpose. Photobiomodulation is intended for relieving pain and inflammation, regulating immune responses as well as stimulating wound healing and tissue regeneration. This helps in combatting the main pathological causes of implant failures that are, peri-implant mucositis and peri-implantitis as well as helps promote osseointegration and improve stability of implants. While the scope of photobiomodulation has been thoroughly investigated in in-vitro and animal studies, human clinical trials are still scarce which makes appropriate protocol formation with respect to dosage and mode of delivery among other parameters difficult. A recently introduced and potential application of photobiomodulation in the field of implantology aims to deliver the positive effects of biophotonics through in-situ ambulatory PBM therapy called the smart dental implant (SDI) system. This comprehensive review presents the current and future trends in the application of photobiomodulation in the field of dental implantology.

Tratamento cirúrgico da osteomielite dos maxilares: relato de caso / Surgical treatment of osteomyelitis of the jaws: Case report / Tratamento quirúrgico de la osteomielitis de los maxilares: reporte de um caso

A Osteomielite dos Maxilares (OM) é uma inflamação óssea, de origem na maioria infecciosa, podendo atingir a porção medular e cortical dos ossos maxilares. Apresenta-se em maior extensão na mandíbula, devido ao pobre suprimento sanguíneo que essa possui, sendo mais prevalente em homens entre a faixa etária de 40 a 60 anos. Sua etiologia está relacionada principalmente às infecções odontogênicas, infecções secundárias e corpos estranhos ocasionais, como os implantes dentários. Tem-se por objetivo apresentar um relato de caso clínico sobre OM na região posterior da mandíbula, bem como sua associação a uma insatisfatória implantação dentária onde houve desenvolvimento de lesão peri-implantar. Paciente do gênero feminino, 53 anos, melanoderma, apresentou dor crônica, abaulamento ósseo sem outros sinais significativos na região de molares inferiores no lado direito, radiograficamente visualizava-se imagem mista sendo sugestiva de sequestro ósseo. Na história pregressa relatou ter realizado explantação na referida região após ser diagnosticada com peri implantite. Ao final do estudo concluiu-se que a afecção teve como causa a infecção bacteriana proveniente de contaminação durante a inserção de implante dentário. Optou-se por remoção cirúrgica do osso necrótico e inflamado... (AU)

Osteomyelitis of the Jaws (OM) is a bone inflammation, of mostly infectious origin, which can affect the medullary and cortical portion of the maxillary bones. It presents itself to a greater extent in the mandible, due to the poor blood supply that it has, being more prevalent in men between the age group of 40 to 60 years. Its etiology is mainly related to odontogenic infections, secondary infections and occasional foreign bodies, such as dental implants. The objective is to present a clinical case report on OM in the posterior region of the mandible, as well as its association with an unsatisfactory dental implantation, where there was development of a peri-implant lesion. Female patient, 53 years old, melanoderma, presented chronic pain, bone bulging without other significant signs in the region of lower molars on the right side, radiographically a mixed image was visualized, suggesting bone sequestration. In her previous history, she reported having performed explantation in that region after being diagnosed with peri-implantitis. At the end of the study, it was concluded that the disease was caused by bacterial infection from contamination during dental implant insertion. We opted for surgical removal of the necrotic and inflamed bone... (AU)

La osteomielitis de los maxilares (OM) es una inflamación de los huesos, en su mayoría de origen infeccioso, que puede afectar la porción medular y cortical de los huesos maxilares. Se presenta en mayor medida en la mandíbula, debido a la escasa irrigación sanguínea que tiene, siendo más prevalente en hombres entre el grupo de edad de 40 a 60 años. Su etiología se relaciona principalmente con infecciones odontogénicas, infecciones secundarias y cuerpos extraños ocasionales, como los implantes dentales. El objetivo es presentar un reporte de caso de OM en la región posterior de la mandíbula, así como su asociación con una implantación dentaria insatisfactoria a partir de la cual desarrollamos una lesión periimplantaria. Paciente femenina, 53 años, melanodermia, presenta dolor crónico, tumefacción ósea con otros signos significativos en región molar inferior del lado derecho, radiográficamente se visualiza imagen mixta sugestiva de pérdida ósea. En su historia previa menciona haber realizado una explantación en esa región tras ser diagnosticada de periimplantitis. Al final del estudio, se concluyó que la enfermedad fue causada por una infección bacteriana provocada por la contaminación durante la inserción del implante dental. Se optó por la extirpación quirúrgica de la piel necrótica e inflamada... (AU)

Impacto de cesación de tabaquismo en la calidad de vida relacionada a la salud bucal de fumadores con implantes oseointegrados / The impact of tobacco cesation on life quality related to oral health

El tabaquismo es un importante factor de riesgo para las enfermedades periodontales y periimplantares. Los fumadores tienen más posibilidades de presentar pérdida de dientes e implantes y puede promover un impacto negativo en la calidad de vida relacionada a la salud bucal (QVRSB). Este estudio prospectivo tiene como objetivo verificar el impacto de la cesación de tabaquismo sobre la QVRSB de pacientes fumadores que recibieron implantes oseointegrados. Todos los participantes recibieron terapia antitabáquica y rehabilitación protética implantosoportada. Fue aplicado un cuestionario OHIP-14 para evaluar la calidad de vida relacionada a la salud bucal. La exposición a tabaco fue evaluada por dedio de un cuestionario estructurado y validado por medición de los niveles de monóxido de carbono expirado. Pacientes que consiguieron dejar de fumar (NF) fueron comparados con pacientes fumadores que no consiguieron dejar de fumar(F) en relación al OHIP-14. Durante el período de estudio, fueron incluídos 83 pacientes, de los cuales 77 permanecieron hasta el final del estudio. La media de cigarros fumados por día fue de 14,3 y un número medio de años de tabaquismo fue de 29,8 años. Hubo reducción significativa de los escores medios de OHIP-14 en los dos grupos: que dejaron de fumar que no consiguieron de dejar de fumar. Por otro lado, no hubo diferencia entre los grupos en relación a la media de OHIP-14. Dentro de los límites del estudio, concluímos que dejar de fumar no tiene impacto significativo en la calidad de vida relacionada a la salud bucal (AU)

Role of decontamination treatment for implant surface in the treatment of peri-implantitis / 中南大学学报(医学版)

Peri-implantitis, characterized by inflammation of tissues around implants and gradual loss of supporting bone tissue, has become one of the main causes for implant failure. Thoroughly removing the plaque biofilm on the implant surface is the first principle in the treatment of peri-implantitis. For this reason, various decontamination methods have been proposed, which can be divided into 2 categories: Removing biofilm and killing microorganisms according to the effect of plaque biofilm on the implant surface. However, at present, there is no decontamination method that can completely remove the plaque biofilm on the implant surface, and it lacks of clinical recommended guidelines. To understand the advantages and disadvantages, effectiveness and safety for different implant surface decontamination methods is of great significance to guide the clinical selection for peri-implantitis treatment.

Efficacy of combined application of glycine powder air-polishing in non-surgical treatment of peri-implant diseases / 北京大学学报(医学版)

OBJECTIVE@#To compare the clinical efficacy of combined application of glycine powder air-polishing and mechanical submucosal debridement in non-surgical treatment of peri-implant diseases.@*METHODS@#A randomized controlled clinical study was carried out on patients diagnosed with peri-implant diseases in the Department of Periodontology, Peking University School and Hospital of Stomatology, between May of 2020 and June of 2021.Twenty-eight patients with totally sixty-two implants were enrolled.The patients were randomly divided into the test group and control group. The patients in the test group (13 subjects/32 implants) received mechanical submucosal debridement using titanium curettes combined with application of glycine powder air-polishing, while the control group (15 subjects/30 implants) received mechanical submucosal debridement using titanium only. Clinical parameters, such as plaque index (PLI), pocket probing depth (PPD), bleeding index (BI) and the percentage of suppuration on probing on implants' level (SoP%) were measured at baseline and 8 weeks after non-surgical intervention. Changes and group differences of clinical parameters of the implants before and 8 weeks after non-surgical intervention were compared.@*RESULTS@#Mean PLI, PPD, BI of both the test group and control group significantly reduced 8 weeks after non-surgical intervention (P < 0.05). Compared with the control group, the test group achieved lower BI (2.7±0.8 vs. 2.2±0.7, P < 0.05), more reduction of BI (0.6±0.7 vs. 1.1±0.6, P < 0.01) and more reduction of SoP% (21.9% vs. 10%, P < 0.05) after non-surgical intervention. Both the control and test groups exhibited comparable PLI and PPD reductions (P>0.05). For the implants diagnosed with peri-implant mucositis, the test group revealed more signi-ficant reduction in BI and SoP% than the control group (1.0±0.7 vs. 0.4±0.7, P=0.02; 6.3% vs. 0, P=0.012). There was no significant difference existing in PLI and PD improvement between the control group and test group (P>0.05). For the implants diagnosed with peri-implantitis, there was no significant difference existing in PLI, PPD, BI and SoP% improvement values between the test and control groups (P>0.05). No complications or discomforts were reported during the study.@*CONCLUSION@#Both treatment procedures could relieve the inflammation of peri-implant soft tissue. Non-surgical mechanical submucosal debridement combined application of glycine powder air-polishing is associated with significant reduction of soft tissue bleeding and suppuration on probing especially in the implants diagnosed with peri-implant mucositis.

D-methionine eradicates Porphyromonas gingivalis biofilms by suppressing the cyclic di-GMP level / 口腔疾病防治

Objective@#To investigate the mechanisms by which D-methionine (D-Met) eradicates Porphyromonas gingivalis biofilms by suppressing cyclic dimeric GMP (c-di-GMP) levels.@*Methods @#Cell viability, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were measured to determine the effective concentrations of D-Met, which were subsequently used in the following experiments. During the P. gingivalis biofilm formation inhibition experiment and the mature biofilm disassembly experiment, biofilm biomass, exopolysaccharide (EPS), biofilm morphology, integrity of the cell membrane, and the level of c-di-GMP were determined. @*Results @# D-Met < 40 mmol/L was biocompatible. During the biofilm formation inhibition and mature biofilm disassembly experiments, D-Met ≥ 20 mmol/L decreased the biofilm biomass and the production of EPS. SEM analysis showed that the extracellular matrix and bacterial density were drastically reduced by D-Met ≥ 20 mmol/L. TEM detection showed that 35 mmol/L D-Met ruptured the cell membrane during biofilm formation and increased the permeability of the cell membrane in the disassembly phase of mature biofilms. C-di-GMP levels decreased with increasing concentrations of D-Met in a concentration-dependent manner.@* Conclusion @# D-Met ≥ 20 mmol/L could eradicate P. gingivalis biofilms by suppressing c-di-GMP levels.

Types and treatment of peri-implantitis bone defects / 口腔疾病防治

@#The reconstruction effect of peri-implantitis bone defects depends on their morphological characteristics. This paper reviews the morphological classification and treatment of peri-implantitis bone defects. A literature review shows that the morphological classification of bone defects in peri-implantitis includes morphology classification and clinical classification. At present, the Renvert classification is more commonly used in the clinic and is divided into four-wall bone pockets, three-wall bone pockets, two-wall bone pockets, one-wall bone pocket and dehiscence according to the number of bone walls. This has guiding significance in the treatment plan of peri-implantitis. The treatment of peri-implantitis depends on the severity of peri-implant bone defects. Peri-implantitis with mild bone defects is treated by nonsurgical treatment, peri-implantitis with severe bone defects is recommended to remove the implant, and peri-implantitis with moderate bone defects is further judged according to the shape of the bone defects. Four-wall bone pockets, three-wall bone pockets and dehiscence are mostly treated by bone regenerative surgery. For shallow two-wall bone pockets, one-wall bone pockets and horizontal bone resorption, bone resection is often used. However, most peri-implantitis has a variety of bone defect forms at the same time, which need to be treated with bone regenerative surgery and bone resection surgery.